Hello, Just Got Planning Passed For Single Story Extension

Hi, been browsing as a stranger for various pieces of advice around what to include in plans and what not to.

Finally my planning application has been approved. I live in a garden suburb in Liverpool, conservation area, house circa 1910. My project is probably really small and simple compared to some on the site. It's a straight forward (hopefully) single storey extension 3m x 6m. Weve got to use materials that are in keeping with the existing property, brick up to about 1.5m and then pebble on top so wall will be a mix of brick and block. Plain clay roof tiles, 9/12 roof probably. I'm hoping to do most of the manual work myself, but getting experts for the brickying and other specialist trades.

Over Easter I've taken the opportunity to dig some prospecting holes to see how far down the current house foundations go and check the lines of the drains. Found an inspection chamber hidden under the patio flags

Hi and welcome to the forum. there is no such thing as a project that's too small for the forum.

Looks like you hace found your first challenge, so moce that inspection chamber and re route the drains as necesary.

Chances are you will be required to dig the foundations a bit deeper than the original. When we extended a 1930's semi the original foundations were no more than 2 feet deep and there had been no movement, but we were required to dig the extension foundations 1 metre deep.

Sorry, not applied for building regs yet (soon) but probably going to be building notice rather than full plans. The extension will have steel in it to remove an existing outer wall and have it open plan into the extension. I understand that we can submit the steel calcs after we submit the building notice and get started with the work.

It's across the back but not fully across. We have a funny little outhouse that can't be knocked down, one of the conditions on the planning. Going to need to tie the new extension into it and have a bit of a box gutter between the out house roof and the new extension wall.